Infusions first reach the right atrium of the heart. Normally, infusion is through the venous blood vessels, in which the drug gradually converges to the superior and inferior vena cava with the flow of blood circulation, and then enters the right atrium through the superior and inferior vena cava. It then enters the right ventricle, then the pulmonary artery, after passing through the lungs it flows into the left atrium, then the left ventricle, and finally shoots into the aorta, further spreading to the small blood vessels and capillaries throughout the body. Note that infusion is a very strict medical operation, if you need to carry out infusion, be sure to go to a regular hospital to carry out the operation, do not carry out the operation at home by yourself, or go to a small clinic without medical qualifications to carry out infusion, so as not to cause damage to the human body.